[glibc.git] / sysdeps / i386 / dl-machine.h

/* Machine-dependent ELF dynamic relocation inline functions.  i386 version.
   Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public License as
   published by the Free Software Foundation; either version 2 of the
   License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with the GNU C Library; see the file COPYING.LIB.  If not,
   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#ifndef dl_machine_h
#define dl_machine_h

#define ELF_MACHINE_NAME "i386"

#include <sys/param.h>

#include <assert.h>

/* Return nonzero iff E_MACHINE is compatible with the running host.  */
static inline int __attribute__ ((unused))
elf_machine_matches_host (Elf32_Half e_machine)
{
  switch (e_machine)
    {
    case EM_386:
    case EM_486:
      return 1;
    default:
      return 0;
    }
}


/* Return the link-time address of _DYNAMIC.  Conveniently, this is the
   first element of the GOT.  This must be inlined in a function which
   uses global data.  */
static inline Elf32_Addr
elf_machine_dynamic (void)
{
  register Elf32_Addr *got asm ("%ebx");
  return *got;
}


/* Return the run-time load address of the shared object.  */
static inline Elf32_Addr __attribute__ ((unused))
elf_machine_load_address (void)
{
  Elf32_Addr addr;
  asm ("	call .Lhere\n"
       ".Lhere:	popl %0\n"
       "	subl $.Lhere, %0"
       : "=r" (addr));
  return addr;
}
/* The `subl' insn above will contain an R_386_32 relocation entry
   intended to insert the run-time address of the label `.Lhere'.
   This will be the first relocation in the text of the dynamic linker;
   we skip it to avoid trying to modify read-only text in this early stage.  */
#define ELF_MACHINE_BEFORE_RTLD_RELOC(dynamic_info) \
  ++(const Elf32_Rel *) (dynamic_info)[DT_REL]->d_un.d_ptr; \
  (dynamic_info)[DT_RELSZ]->d_un.d_val -= sizeof (Elf32_Rel);


#ifndef PROF
/* We add a declaration of this function here so that in dl-runtime.c
   the ELF_MACHINE_RUNTIME_TRAMPOLINE macro really can pass the parameters
   in registers.

   We cannot use this scheme for profiling because the _mcount call
   destroys the passed register information.  */
static ElfW(Addr) fixup (struct link_map *l, ElfW(Word) reloc_offset)
     __attribute__ ((regparm (2), unused));
#endif

/* Set up the loaded object described by L so its unrelocated PLT
   entries will jump to the on-demand fixup code in dl-runtime.c.  */

static inline int
elf_machine_runtime_setup (struct link_map *l, int lazy)
{
  Elf32_Addr *got;
  extern void _dl_runtime_resolve (Elf32_Word);

  if (l->l_info[DT_JMPREL] && lazy)
    {
      /* The GOT entries for functions in the PLT have not yet been filled
	 in.  Their initial contents will arrange when called to push an
	 offset into the .rel.plt section, push _GLOBAL_OFFSET_TABLE_[1],
	 and then jump to _GLOBAL_OFFSET_TABLE[2].  */
      got = (Elf32_Addr *) (l->l_addr + l->l_info[DT_PLTGOT]->d_un.d_ptr);
      got[1] = (Elf32_Addr) l;	/* Identify this shared object.  */
      /* This function will get called to fix up the GOT entry indicated by
	 the offset on the stack, and then jump to the resolved address.  */
      got[2] = (Elf32_Addr) &_dl_runtime_resolve;
    }

  return lazy;
}

/* This code is used in dl-runtime.c to call the `fixup' function
   and then redirect to the address it returns.  */
#ifndef PROF
# define ELF_MACHINE_RUNTIME_TRAMPOLINE asm ("\
	.globl _dl_runtime_resolve
	.type _dl_runtime_resolve, @function
_dl_runtime_resolve:
	pushl %eax		# Preserve registers otherwise clobbered.
	pushl %ecx
	pushl %edx
	movl 16(%esp), %edx	# Copy args pushed by PLT in register.  Note
	movl 12(%esp), %eax	# that `fixup' takes its parameters in regs.
	call fixup		# Call resolver.
	popl %edx		# Get register content back.
	popl %ecx
	xchgl %eax, (%esp)	# Get %eax contents end store function address.
	ret $8			# Jump to function address.
	.size _dl_runtime_resolve, .-_dl_runtime_resolve
");
#else
# define ELF_MACHINE_RUNTIME_TRAMPOLINE asm ("\
	.globl _dl_runtime_resolve
	.type _dl_runtime_resolve, @function
_dl_runtime_resolve:
	pushl %eax		# Preserve registers otherwise clobbered.
	pushl %ecx
	pushl %edx
	movl 16(%esp), %edx	# Push the arguments for `fixup'
	movl 12(%esp), %eax
	pushl %edx
	pushl %eax
	call fixup		# Call resolver.
	popl %edx		# Pop the parameters
	popl %ecx
	popl %edx		# Get register content back.
	popl %ecx
	xchgl %eax, (%esp)	# Get %eax contents end store function address.
	ret $8			# Jump to function address.
	.size _dl_runtime_resolve, .-_dl_runtime_resolve
");
#endif
/* The PLT uses Elf32_Rel relocs.  */
#define elf_machine_relplt elf_machine_rel

/* Mask identifying addresses reserved for the user program,
   where the dynamic linker should not map anything.  */
#define ELF_MACHINE_USER_ADDRESS_MASK	0xf8000000UL


/* Initial entry point code for the dynamic linker.
   The C function `_dl_start' is the real entry point;
   its return value is the user program's entry point.  */

#define RTLD_START asm ("\
.text\n\
.globl _start\n\
.globl _dl_start_user\n\
_start:\n\
	pushl %esp\n\
	call _dl_start\n\
	popl %ebx\n\
_dl_start_user:\n\
	# Save the user entry point address in %edi.\n\
	movl %eax, %edi\n\
	# Point %ebx at the GOT.
	call 0f\n\
0:	popl %ebx\n\
	addl $_GLOBAL_OFFSET_TABLE_+[.-0b], %ebx\n\
	# See if we were run as a command with the executable file\n\
	# name as an extra leading argument.\n\
	movl _dl_skip_args@GOT(%ebx), %eax\n\
	movl (%eax), %eax\n\
	# Pop the original argument count.\n\
	popl %ecx\n\
	# Subtract _dl_skip_args from it.\n\
	subl %eax, %ecx\n\
	# Adjust the stack pointer to skip _dl_skip_args words.\n\
	leal (%esp,%eax,4), %esp\n\
	# Push back the modified argument count.\n\
	pushl %ecx\n\
	# Push _dl_default_scope[2] as argument in _dl_init_next call below.\n\
	movl _dl_default_scope@GOT(%ebx), %eax\n\
	movl 8(%eax), %esi\n\
0:	pushl %esi\n\
	# Call _dl_init_next to return the address of an initializer\n\
	# function to run.\n\
	call _dl_init_next@PLT\n\
	addl $4, %esp # Pop argument.\n\
	# Check for zero return, when out of initializers.\n\
	testl %eax, %eax\n\
	jz 1f\n\
	# Call the shared object initializer function.\n\
	# NOTE: We depend only on the registers (%ebx, %esi and %edi)\n\
	# and the return address pushed by this call;\n\
	# the initializer is called with the stack just\n\
	# as it appears on entry, and it is free to move\n\
	# the stack around, as long as it winds up jumping to\n\
	# the return address on the top of the stack.\n\
	call *%eax\n\
	# Loop to call _dl_init_next for the next initializer.\n\
	jmp 0b\n\
1:	# Clear the startup flag.\n\
	movl _dl_starting_up@GOT(%ebx), %eax\n\
	movl $0, (%eax)\n\
	# Pass our finalizer function to the user in %edx, as per ELF ABI.\n\
	movl _dl_fini@GOT(%ebx), %edx\n\
	# Jump to the user's entry point.\n\
	jmp *%edi\n\
");

/* Nonzero iff TYPE should not be allowed to resolve to one of
   the main executable's symbols, as for a COPY reloc.  */
#define elf_machine_lookup_noexec_p(type) ((type) == R_386_COPY)

/* Nonzero iff TYPE describes relocation of a PLT entry, so
   PLT entries should not be allowed to define the value.  */
#define elf_machine_lookup_noplt_p(type) ((type) == R_386_JMP_SLOT)

/* A reloc type used for ld.so cmdline arg lookups to reject PLT entries.  */
#define ELF_MACHINE_RELOC_NOPLT	R_386_JMP_SLOT

/* The i386 never uses Elf32_Rela relocations.  */
#define ELF_MACHINE_NO_RELA 1

#endif /* !dl_machine_h */

#ifdef RESOLVE

extern char **_dl_argv;

/* Perform the relocation specified by RELOC and SYM (which is fully resolved).
   MAP is the object containing the reloc.  */

static inline void
elf_machine_rel (struct link_map *map, const Elf32_Rel *reloc,
		 const Elf32_Sym *sym, const struct r_found_version *version)
{
  Elf32_Addr *const reloc_addr = (void *) (map->l_addr + reloc->r_offset);

  if (ELF32_R_TYPE (reloc->r_info) == R_386_RELATIVE)
    {
#ifndef RTLD_BOOTSTRAP
      if (map != &_dl_rtld_map) /* Already done in rtld itself.  */
#endif
	*reloc_addr += map->l_addr;
    }
  else if (ELF32_R_TYPE (reloc->r_info) != R_386_NONE)
    {
      const Elf32_Sym *const refsym = sym;
      Elf32_Addr value = RESOLVE (&sym, version, ELF32_R_TYPE (reloc->r_info));
      if (sym)
	value += sym->st_value;

      switch (ELF32_R_TYPE (reloc->r_info))
	{
	case R_386_COPY:
	  if (sym == NULL)
	    /* This can happen in trace mode if an object could not be
	       found.  */
	    break;
	  if (sym->st_size > refsym->st_size
	      || (_dl_verbose && sym->st_size < refsym->st_size))
	    {
	      const char *strtab;

	      strtab = ((void *) map->l_addr
			+ map->l_info[DT_STRTAB]->d_un.d_ptr);
	      _dl_sysdep_error (_dl_argv[0] ?: "<program name unknown>",
				": Symbol `", strtab + refsym->st_name,
				"' has different size in shared object, "
				"consider re-linking\n", NULL);
	    }
	  memcpy (reloc_addr, (void *) value, MIN (sym->st_size,
						   refsym->st_size));
	  break;
	case R_386_GLOB_DAT:
	case R_386_JMP_SLOT:
	  *reloc_addr = value;
	  break;
	case R_386_32:
	  {
#ifndef RTLD_BOOTSTRAP
	   /* This is defined in rtld.c, but nowhere in the static
	      libc.a; make the reference weak so static programs can
	      still link.  This declaration cannot be done when
	      compiling rtld.c (i.e.  #ifdef RTLD_BOOTSTRAP) because
	      rtld.c contains the common defn for _dl_rtld_map, which
	      is incompatible with a weak decl in the same file.  */
	    weak_extern (_dl_rtld_map);
	    if (map == &_dl_rtld_map)
	      /* Undo the relocation done here during bootstrapping.
		 Now we will relocate it anew, possibly using a
		 binding found in the user program or a loaded library
		 rather than the dynamic linker's built-in definitions
		 used while loading those libraries.  */
	      value -= map->l_addr + refsym->st_value;
#endif
	    *reloc_addr += value;
	    break;
	  }
	case R_386_PC32:
	  *reloc_addr += (value - (Elf32_Addr) reloc_addr);
	  break;
	default:
	  assert (! "unexpected dynamic reloc type");
	  break;
	}
    }
}

static inline void
elf_machine_lazy_rel (struct link_map *map, const Elf32_Rel *reloc)
{
  Elf32_Addr *const reloc_addr = (void *) (map->l_addr + reloc->r_offset);
  switch (ELF32_R_TYPE (reloc->r_info))
    {
    case R_386_JMP_SLOT:
      *reloc_addr += map->l_addr;
      break;
    default:
      assert (! "unexpected PLT reloc type");
      break;
    }
}

#endif /* RESOLVE */
Commit	Line	Data
d66e34cd	1	/* Machine-dependent ELF dynamic relocation inline functions. i386 version.
831372e7	2	Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc.
47707456	3	This file is part of the GNU C Library.
d66e34cd	4
47707456 UD	5	The GNU C Library is free software; you can redistribute it and/or
	6	modify it under the terms of the GNU Library General Public License as
	7	published by the Free Software Foundation; either version 2 of the
	8	License, or (at your option) any later version.
d66e34cd	9
47707456 UD	10	The GNU C Library is distributed in the hope that it will be useful,
	11	but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	13	Library General Public License for more details.
d66e34cd	14
47707456	15	You should have received a copy of the GNU Library General Public
01c901a5 UD	16	License along with the GNU C Library; see the file COPYING.LIB. If not,
	17	write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
	18	Boston, MA 02111-1307, USA. */
d66e34cd	19
f51d1dfd RM	20	#ifndef dl_machine_h
	21	#define dl_machine_h
	22
d66e34cd RM	23	#define ELF_MACHINE_NAME "i386"
d66e34cd RM	24
1f07e617 UD	25	#include <sys/param.h>
1f07e617 UD	26
d66e34cd	27	#include <assert.h>
d66e34cd RM	28
d66e34cd RM	29	/* Return nonzero iff E_MACHINE is compatible with the running host. */
e75154a6	30	static inline int __attribute__ ((unused))
d66e34cd RM	31	elf_machine_matches_host (Elf32_Half e_machine)
	32	{
	33	switch (e_machine)
	34	{
	35	case EM_386:
	36	case EM_486:
	37	return 1;
	38	default:
	39	return 0;
	40	}
	41	}
	42
	43
47707456 UD	44	/* Return the link-time address of _DYNAMIC. Conveniently, this is the
	45	first element of the GOT. This must be inlined in a function which
	46	uses global data. */
	47	static inline Elf32_Addr
	48	elf_machine_dynamic (void)
d66e34cd RM	49	{
d66e34cd RM	50	register Elf32_Addr *got asm ("%ebx");
47707456	51	return *got;
d66e34cd RM	52	}
	53
	54
	55	/* Return the run-time load address of the shared object. */
e75154a6	56	static inline Elf32_Addr __attribute__ ((unused))
d66e34cd RM	57	elf_machine_load_address (void)
	58	{
	59	Elf32_Addr addr;
779ae82e UD	60	asm (" call .Lhere\n"
	61	".Lhere: popl %0\n"
	62	" subl $.Lhere, %0"
d66e34cd RM	63	: "=r" (addr));
	64	return addr;
	65	}
	66	/* The `subl' insn above will contain an R_386_32 relocation entry
779ae82e	67	intended to insert the run-time address of the label `.Lhere'.
d66e34cd RM	68	This will be the first relocation in the text of the dynamic linker;
	69	we skip it to avoid trying to modify read-only text in this early stage. */
	70	#define ELF_MACHINE_BEFORE_RTLD_RELOC(dynamic_info) \
44c8d1a2	71	++(const Elf32_Rel *) (dynamic_info)[DT_REL]->d_un.d_ptr; \
a993273c	72	(dynamic_info)[DT_RELSZ]->d_un.d_val -= sizeof (Elf32_Rel);
d66e34cd	73
d66e34cd	74
5ae9d168	75	#ifndef PROF
831372e7 UD	76	/* We add a declaration of this function here so that in dl-runtime.c
831372e7 UD	77	the ELF_MACHINE_RUNTIME_TRAMPOLINE macro really can pass the parameters
5ae9d168 UD	78	in registers.
	79
	80	We cannot use this scheme for profiling because the _mcount call
	81	destroys the passed register information. */
831372e7 UD	82	static ElfW(Addr) fixup (struct link_map *l, ElfW(Word) reloc_offset)
831372e7 UD	83	__attribute__ ((regparm (2), unused));
5ae9d168	84	#endif
831372e7	85
d66e34cd RM	86	/* Set up the loaded object described by L so its unrelocated PLT
	87	entries will jump to the on-demand fixup code in dl-runtime.c. */
	88
0501d603	89	static inline int
a2e1b046	90	elf_machine_runtime_setup (struct link_map *l, int lazy)
d66e34cd	91	{
a1a9d215	92	Elf32_Addr *got;
d66e34cd	93	extern void _dl_runtime_resolve (Elf32_Word);
a1a9d215	94
a2e1b046 RM	95	if (l->l_info[DT_JMPREL] && lazy)
	96	{
	97	/* The GOT entries for functions in the PLT have not yet been filled
	98	in. Their initial contents will arrange when called to push an
	99	offset into the .rel.plt section, push _GLOBAL_OFFSET_TABLE_[1],
	100	and then jump to _GLOBAL_OFFSET_TABLE[2]. */
	101	got = (Elf32_Addr *) (l->l_addr + l->l_info[DT_PLTGOT]->d_un.d_ptr);
	102	got[1] = (Elf32_Addr) l; /* Identify this shared object. */
	103	/* This function will get called to fix up the GOT entry indicated by
	104	the offset on the stack, and then jump to the resolved address. */
	105	got[2] = (Elf32_Addr) &_dl_runtime_resolve;
	106	}
d66e34cd	107
0501d603 UD	108	return lazy;
0501d603 UD	109	}
831372e7	110
0501d603 UD	111	/* This code is used in dl-runtime.c to call the `fixup' function
0501d603 UD	112	and then redirect to the address it returns. */
5ae9d168 UD	113	#ifndef PROF
5ae9d168 UD	114	# define ELF_MACHINE_RUNTIME_TRAMPOLINE asm ("\
38334018 RM	115	.globl _dl_runtime_resolve
	116	.type _dl_runtime_resolve, @function
	117	_dl_runtime_resolve:
831372e7 UD	118	pushl %eax # Preserve registers otherwise clobbered.
	119	pushl %ecx
	120	pushl %edx
	121	movl 16(%esp), %edx # Copy args pushed by PLT in register. Note
	122	movl 12(%esp), %eax # that `fixup' takes its parameters in regs.
	123	call fixup # Call resolver.
	124	popl %edx # Get register content back.
	125	popl %ecx
	126	xchgl %eax, (%esp) # Get %eax contents end store function address.
	127	ret $8 # Jump to function address.
	128	.size _dl_runtime_resolve, .-_dl_runtime_resolve
38334018	129	");
5ae9d168 UD	130	#else
	131	# define ELF_MACHINE_RUNTIME_TRAMPOLINE asm ("\
	132	.globl _dl_runtime_resolve
	133	.type _dl_runtime_resolve, @function
	134	_dl_runtime_resolve:
	135	pushl %eax # Preserve registers otherwise clobbered.
	136	pushl %ecx
	137	pushl %edx
	138	movl 16(%esp), %edx # Push the arguments for `fixup'
	139	movl 12(%esp), %eax
	140	pushl %edx
	141	pushl %eax
	142	call fixup # Call resolver.
	143	popl %edx # Pop the parameters
	144	popl %ecx
	145	popl %edx # Get register content back.
	146	popl %ecx
	147	xchgl %eax, (%esp) # Get %eax contents end store function address.
	148	ret $8 # Jump to function address.
	149	.size _dl_runtime_resolve, .-_dl_runtime_resolve
	150	");
	151	#endif
38334018 RM	152	/* The PLT uses Elf32_Rel relocs. */
38334018 RM	153	#define elf_machine_relplt elf_machine_rel
d66e34cd	154
5bf62f2d RM	155	/* Mask identifying addresses reserved for the user program,
	156	where the dynamic linker should not map anything. */
	157	#define ELF_MACHINE_USER_ADDRESS_MASK 0xf8000000UL
	158
	159
	160
d66e34cd RM	161	/* Initial entry point code for the dynamic linker.
	162	The C function `_dl_start' is the real entry point;
	163	its return value is the user program's entry point. */
	164
	165	#define RTLD_START asm ("\
	166	.text\n\
	167	.globl _start\n\
421f82e5 RM	168	.globl _dl_start_user\n\
421f82e5 RM	169	_start:\n\
8d6468d0	170	pushl %esp\n\
421f82e5	171	call _dl_start\n\
8d6468d0	172	popl %ebx\n\
421f82e5 RM	173	_dl_start_user:\n\
	174	# Save the user entry point address in %edi.\n\
	175	movl %eax, %edi\n\
	176	# Point %ebx at the GOT.
a1a9d215 RM	177	call 0f\n\
	178	0: popl %ebx\n\
	179	addl $_GLOBAL_OFFSET_TABLE_+[.-0b], %ebx\n\
	180	# See if we were run as a command with the executable file\n\
	181	# name as an extra leading argument.\n\
24906b43	182	movl _dl_skip_args@GOT(%ebx), %eax\n\
edf5b2d7	183	movl (%eax), %eax\n\
24906b43 RM	184	# Pop the original argument count.\n\
	185	popl %ecx\n\
	186	# Subtract _dl_skip_args from it.\n\
	187	subl %eax, %ecx\n\
	188	# Adjust the stack pointer to skip _dl_skip_args words.\n\
	189	leal (%esp,%eax,4), %esp\n\
	190	# Push back the modified argument count.\n\
	191	pushl %ecx\n\
ba79d61b RM	192	# Push _dl_default_scope[2] as argument in _dl_init_next call below.\n\
	193	movl _dl_default_scope@GOT(%ebx), %eax\n\
	194	movl 8(%eax), %esi\n\
f68b86cc	195	0: pushl %esi\n\
d66e34cd RM	196	# Call _dl_init_next to return the address of an initializer\n\
d66e34cd RM	197	# function to run.\n\
f68b86cc RM	198	call _dl_init_next@PLT\n\
f68b86cc RM	199	addl $4, %esp # Pop argument.\n\
d66e34cd	200	# Check for zero return, when out of initializers.\n\
edf5b2d7	201	testl %eax, %eax\n\
d66e34cd RM	202	jz 1f\n\
d66e34cd RM	203	# Call the shared object initializer function.\n\
f68b86cc	204	# NOTE: We depend only on the registers (%ebx, %esi and %edi)\n\
d66e34cd RM	205	# and the return address pushed by this call;\n\
	206	# the initializer is called with the stack just\n\
	207	# as it appears on entry, and it is free to move\n\
	208	# the stack around, as long as it winds up jumping to\n\
	209	# the return address on the top of the stack.\n\
	210	call *%eax\n\
	211	# Loop to call _dl_init_next for the next initializer.\n\
	212	jmp 0b\n\
39778c6c	213	1: # Clear the startup flag.\n\
edf5b2d7 UD	214	movl _dl_starting_up@GOT(%ebx), %eax\n\
edf5b2d7 UD	215	movl $0, (%eax)\n\
39778c6c	216	# Pass our finalizer function to the user in %edx, as per ELF ABI.\n\
a1a9d215	217	movl _dl_fini@GOT(%ebx), %edx\n\
421f82e5 RM	218	# Jump to the user's entry point.\n\
421f82e5 RM	219	jmp *%edi\n\
d66e34cd	220	");
f51d1dfd	221
34b402e5 UD	222	/* Nonzero iff TYPE should not be allowed to resolve to one of
34b402e5 UD	223	the main executable's symbols, as for a COPY reloc. */
bc9f6000 UD	224	#define elf_machine_lookup_noexec_p(type) ((type) == R_386_COPY)
	225
	226	/* Nonzero iff TYPE describes relocation of a PLT entry, so
	227	PLT entries should not be allowed to define the value. */
	228	#define elf_machine_lookup_noplt_p(type) ((type) == R_386_JMP_SLOT)
	229
	230	/* A reloc type used for ld.so cmdline arg lookups to reject PLT entries. */
	231	#define ELF_MACHINE_RELOC_NOPLT R_386_JMP_SLOT
f51d1dfd RM	232
	233	/* The i386 never uses Elf32_Rela relocations. */
	234	#define ELF_MACHINE_NO_RELA 1
	235
	236	#endif /* !dl_machine_h */
	237
	238	#ifdef RESOLVE
	239
f21acc89 UD	240	extern char **_dl_argv;
f21acc89 UD	241
f51d1dfd RM	242	/* Perform the relocation specified by RELOC and SYM (which is fully resolved).
	243	MAP is the object containing the reloc. */
	244
	245	static inline void
c84142e8	246	elf_machine_rel (struct link_map map, const Elf32_Rel reloc,
1fb05e3d	247	const Elf32_Sym sym, const struct r_found_version version)
f51d1dfd RM	248	{
f51d1dfd RM	249	Elf32_Addr const reloc_addr = (void ) (map->l_addr + reloc->r_offset);
f51d1dfd	250
bc9f6000	251	if (ELF32_R_TYPE (reloc->r_info) == R_386_RELATIVE)
f51d1dfd	252	{
f51d1dfd RM	253	#ifndef RTLD_BOOTSTRAP
	254	if (map != &_dl_rtld_map) /* Already done in rtld itself. */
	255	#endif
	256	*reloc_addr += map->l_addr;
f51d1dfd	257	}
714a562f	258	else if (ELF32_R_TYPE (reloc->r_info) != R_386_NONE)
bc9f6000	259	{
bc9f6000	260	const Elf32_Sym *const refsym = sym;
bc9f6000 UD	261	Elf32_Addr value = RESOLVE (&sym, version, ELF32_R_TYPE (reloc->r_info));
	262	if (sym)
	263	value += sym->st_value;
	264
	265	switch (ELF32_R_TYPE (reloc->r_info))
	266	{
	267	case R_386_COPY:
5107cf1d UD	268	if (sym == NULL)
	269	/* This can happen in trace mode if an object could not be
	270	found. */
	271	break;
cf29ffbe UD	272	if (sym->st_size > refsym->st_size
cf29ffbe UD	273	\|\| (_dl_verbose && sym->st_size < refsym->st_size))
1f07e617 UD	274	{
	275	const char *strtab;
	276
	277	strtab = ((void *) map->l_addr
	278	+ map->l_info[DT_STRTAB]->d_un.d_ptr);
60c96635 UD	279	_dl_sysdep_error (_dl_argv[0] ?: "<program name unknown>",
60c96635 UD	280	": Symbol `", strtab + refsym->st_name,
1f07e617 UD	281	"' has different size in shared object, "
	282	"consider re-linking\n", NULL);
	283	}
	284	memcpy (reloc_addr, (void *) value, MIN (sym->st_size,
	285	refsym->st_size));
bc9f6000 UD	286	break;
	287	case R_386_GLOB_DAT:
	288	case R_386_JMP_SLOT:
	289	*reloc_addr = value;
	290	break;
	291	case R_386_32:
	292	{
	293	#ifndef RTLD_BOOTSTRAP
	294	/* This is defined in rtld.c, but nowhere in the static
	295	libc.a; make the reference weak so static programs can
	296	still link. This declaration cannot be done when
	297	compiling rtld.c (i.e. #ifdef RTLD_BOOTSTRAP) because
	298	rtld.c contains the common defn for _dl_rtld_map, which
	299	is incompatible with a weak decl in the same file. */
	300	weak_extern (_dl_rtld_map);
	301	if (map == &_dl_rtld_map)
	302	/* Undo the relocation done here during bootstrapping.
	303	Now we will relocate it anew, possibly using a
	304	binding found in the user program or a loaded library
	305	rather than the dynamic linker's built-in definitions
	306	used while loading those libraries. */
	307	value -= map->l_addr + refsym->st_value;
	308	#endif
	309	*reloc_addr += value;
	310	break;
	311	}
	312	case R_386_PC32:
	313	*reloc_addr += (value - (Elf32_Addr) reloc_addr);
	314	break;
bc9f6000 UD	315	default:
	316	assert (! "unexpected dynamic reloc type");
	317	break;
	318	}
	319	}
f51d1dfd RM	320	}
	321
	322	static inline void
	323	elf_machine_lazy_rel (struct link_map map, const Elf32_Rel reloc)
	324	{
	325	Elf32_Addr const reloc_addr = (void ) (map->l_addr + reloc->r_offset);
	326	switch (ELF32_R_TYPE (reloc->r_info))
	327	{
	328	case R_386_JMP_SLOT:
	329	*reloc_addr += map->l_addr;
	330	break;
	331	default:
	332	assert (! "unexpected PLT reloc type");
	333	break;
	334	}
	335	}
	336
	337	#endif /* RESOLVE */